Re: [Veritas-bu] Multiplexing on destaging basic disk dssu (FINAL)

Hi All,

I guess I will have to live with it. At the moment the destaging kicks off about 40 jobs writing to two LTO5 drives. I was just hoping to make it faster, but maybe it’s alright the way it is. Oh, well.

Thank all of you for your answers and inspirations.

Regards,

Patrick Whelan

VERITAS Certified NetBackup Support Engineer for UNIX.

VERITAS Certified NetBackup Support Engineer for Windows.

netbackup AT whelan-consulting.co DOT uk

From: Ed Wilts [mailto:ewilts AT ewilts DOT org]
Sent: 01 March 2011 18:27
To: Patrick
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Multiplexing on destaging basic disk dssu

On Tue, Mar 1, 2011 at 5:41 AM, Patrick <netbackup AT whelan-consulting.co DOT uk> wrote:

Is there a way to do the above? If so how?

Short answer: no.

Longer answer: It's been requested multiple times and is being considered for a future release.

There are ways to configure yourself around these limitations by configuring more storage units and reducing the maximum size of a destage run to force it to kick off more jobs. Then you'll run into issues on saturating your disk subsystem... With an LTO-4 taking up to 400MB/sec of well-compressable data, how many of those streams can your disks take?

.../Ed

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